Another option may to be to go directly to
Xotic PC and see what they have to offer from their boutique shop. They offer quite a bit of customization for many of their models.
One thing to note there is that with most of their Sager/Clevo models, the OS is an extra expense found near the bottom of the customization page (other brands usually include OS) and not included in the base price so even though they show the Sager NP8652 as being less expensive, that doesn't include the additional $80 - $105 for Win 10 (although it seems to be less expensive through their boutique)